US11077711B2 - Rubber composition and pneumatic tire - Google Patents

Rubber composition and pneumatic tire Download PDF

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Publication number
US11077711B2
US11077711B2 US15/571,257 US201615571257A US11077711B2 US 11077711 B2 US11077711 B2 US 11077711B2 US 201615571257 A US201615571257 A US 201615571257A US 11077711 B2 US11077711 B2 US 11077711B2
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styrene
mass
rubber composition
butadiene copolymer
rubber
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US20180134078A1 (en
Inventor
Wataru Sakai
Takuma Arikawa
Ryosuke Sakai
Yu Shinke
Yuko Sekine
Fumito Yatsuyanagi
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Kyoto Institute of Technology NUC
Yokohama Rubber Co Ltd
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Kyoto Institute of Technology NUC
Yokohama Rubber Co Ltd
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Assigned to THE YOKOHAMA RUBBER CO., LTD. reassignment THE YOKOHAMA RUBBER CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARIKAWA, TAKUMA, SAKAI, WATARU, SAKAI, RYOSUKE, SEKINE, YUKO, SHINKE, YU, YATSUYANAGI, FUMITO
Assigned to THE YOKOHAMA RUBBER CO., LTD., NATIONAL UNIVERSITY CORPORATION KYOTO INSTITUTE OF TECHNOLOGY reassignment THE YOKOHAMA RUBBER CO., LTD. CORRECTIVE ASSIGNMENT TO CORRECT THE RECEIVING PARTY'S DATA PREVIOUSLY RECORDED ON REEL 045475 FRAME 0111. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: ARIKAWA, TAKUMA, SAKAI, WATARU, SAKAI, RYOSUKE, SEKINE, YUKO, SHINKE, YU, YATSUYANAGI, FUMITO
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Assigned to THE YOKOHAMA RUBBER CO., LTD. reassignment THE YOKOHAMA RUBBER CO., LTD. CHANGE OF ADDRESS FOR ASSIGNEE Assignors: THE YOKOHAMA RUBBER CO., LTD.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016—Compositions of the tread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof

Definitions

  • the present technology relates to a rubber composition and a pneumatic tire.
  • a rubber composition for a tire tread containing from 20 to 100 parts by mass of a reinforcing filler per 100 parts by mass of a rubber component including: from 20 to 80 parts by mass of a solution-polymerized styrene-butadiene copolymer rubber having a microstructure satisfying the following mathematical formulas (1) to (4): Vi ⁇ ST (1) Vi+ 2 ST ⁇ 80 (2) Vi ⁇ 70 (3) ST ⁇ 50 (4)
  • Vi is a 1,2-bond content (%), and cis is a cis-1,4 bond content (%)” (Claim 1 ).
  • the present technology provides a rubber composition with which it is possible to produce a tire exhibiting excellent wear resistance and fuel efficiency, and a pneumatic tire using the rubber composition.
  • the present inventors discovered that a tire exhibiting excellent wear resistance and fuel efficiency can be produced by compounding a styrene-butadiene copolymer having a radical generation index which is not greater than 1.0 and is smaller than a prescribed value, and the present inventors thereby completed the present technology.
  • a rubber composition including a diene rubber and a filler
  • the diene rubber containing at least a styrene-butadiene copolymer
  • radical generation index is an index representation of a radical concentration using a radical concentration of a copolymer having a molar ratio of styrene units/vinyl units (1,2-bonds)/trans units (trans-1,4 bonds)/cis units (cis-1,4 bonds) of 13/14/15/58 as a reference value (1.0);
  • SV mass % in Equation (1) is the mass % of a partial structure in which a styrene single chain having one styrene unit and a vinyl single chain having one vinyl unit are directly linked relative to the amount of bonded styrene of the styrene-butadiene copolymer
  • vinyl unit mol % in Equation (1) is the mol % of vinyl units when a total of styrene units, vinyl units (1,2-bonds), trans units (trans-1,4 bonds), and cis units (cis-1,4 bonds) in the styrene-butadiene copolymer is defined as 100 mol %.
  • FIG. 1 is a schematic partial cross-sectional view of a tire that illustrates one embodiment of a pneumatic tire of the present technology.
  • the rubber composition of the present technology is a rubber composition including a diene rubber and a filler
  • the diene rubber containing at least a styrene-butadiene copolymer
  • a radical generation index of the styrene-butadiene copolymer being not greater than 1.0 and being smaller than a value Y calculated from Equation (1) described below.
  • the rubber composition of the present technology contains such a styrene-butadiene copolymer, excellent wear resistance and fuel efficiency are achieved in a compatible manner when a tire is produced. Although the reason for this is unknown, the reason is presumed to be as follows.
  • the wear resistance is thought to be enhanced as a result of setting the radical generation index, which is based on the radical concentration of a prescribed polymer having a known structure, to not greater than 1.0 and to a value smaller than a value Y calculated by Equation (1) described below so that the deterioration of the rubber caused by radical oxidation is suppressed.
  • the diene rubber in particular, the styrene-butadiene copolymer
  • the filler in particular, the styrene-butadiene copolymer
  • other additives will be described in detail.
  • the diene rubber compounded in the rubber composition of the present technology is not particularly limited as long as it contains a styrene-butadiene copolymer.
  • the radical generation index is an index representation of the radical concentration using the radical concentration of a copolymer having a molar ratio of styrene units/vinyl units (1,2-bonds)/trans units (trans-1,4 bonds)/cis units (cis-1,4 bonds) of 13/14/15/58 as a reference value (1.0).
  • the radical concentration is measured using an electron spin resonance (ESR) device after impregnating a sample of the styrene-butadiene copolymer to be measured with 3.4 mass % of 2,4,6-tri-tert-butylnitrosobenzene (TTBNB) and then pulverizing the compound using a freeze crusher.
  • ESR electron spin resonance
  • the “SV mass %” in Equation (1) above refers to the mass % of a partial structure wherein a styrene single chain having one styrene unit and a vinyl single chain having one vinyl unit are directly linked relative to the amount of bonded styrene of the styrene-butadiene copolymer (also called the “S1V1 structure” hereafter).
  • styrene single chain having one styrene unit refers to a block in which a repeating unit (n in Equation (I) below) is expressed by 1 among the styrene units of the styrene-butadiene copolymer
  • a “vinyl single chain having one vinyl unit” refers to a block in which a repeating unit (m in Equation (I) below) is expressed by 1 among the vinyl units (1,2-bonds) of the styrene-butadiene copolymer.
  • the “vinyl unit mol %” in Equation (1) above refers to the mol % of vinyl units when the total of styrene units, vinyl units (1,2-bonds), trans units (trans-1,4 bonds), and cis units (cis-1,4 bonds) in the styrene-butadiene copolymer is defined as 100 mol %).
  • the radical generation index of the styrene-butadiene copolymer is preferably from 0.1 to 0.8 and more preferably from 0.1 to 0.5 in that the wear resistance is further enhanced.
  • the radical generation index of the styrene-butadiene copolymer is preferably smaller than a value Y2 calculated from the following Equation (2) in that the balance between wear resistance and fuel efficiency is enhanced.
  • Y 2 ⁇ 0.0186 ⁇ ( SV mass %+vinyl unit mol %)+1.4 (2)
  • the amount of bonded styrene of the styrene-butadiene copolymer is not greater than 25 mol % and for the vinyl unit content to be not less than 30% in that the wear resistance is further enhanced.
  • the amount of bonded styrene refers to an amount determined by calculating the mass of styrene in the styrene-butadiene copolymer in terms of moles
  • the vinyl unit content refers to the mol % of vinyl units when the total of styrene units, vinyl units (1,2-bonds), trans units (trans-1,4 bonds), and cis units (cis-1,4 bonds) in the styrene-butadiene copolymer is defined as 100 mol %).
  • the amount of bonded styrene in the styrene-butadiene copolymer is preferably from 2 to 20 mol % and more preferably from 10 to 20 mol %.
  • the vinyl unit content of the styrene-butadiene copolymer is preferably not less than 30 mol % and more preferably not less than 40 mol % and is preferably not greater than 90 mol %.
  • the styrene single chain content having one styrene unit prefferably be not greater than 55 mass % of the amount of bonded styrene and for the partial structure wherein the styrene single chain content having one styrene unit and a vinyl single chain having one vinyl unit are linked directly (S1V1 structure) to be not greater than 10 mass % of the amount of bonded styrene in the styrene-butadiene copolymer.
  • the styrene single chain content is preferably not greater than 40 mass % and more preferably not greater than 30 mass % and is preferably not less than 1 mass % of the amount of bonded styrene.
  • the S1V1 structure content is preferably not greater than 9 mass % and more preferably not greater than 8 mass % and is preferably not less than 1 mass % of the amount of bonded styrene.
  • the content of such a styrene-butadiene copolymer is preferably from 30 to 100 mass % and more preferably from 40 to 100 mass % of the total mass of the diene rubber.
  • the diene rubber is not particularly limited as long as the diene rubber has double bonds in the main chain.
  • Specific examples thereof include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), ethylene-propylene-diene copolymer rubber (EPDM), styrene-isoprene rubber, isoprene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber, and the like.
  • NR natural rubber
  • IR isoprene rubber
  • BR butadiene rubber
  • CR chloroprene rubber
  • NBR acrylonitrile butadiene rubber
  • EPDM ethylene-propylene-diene copolymer rubber
  • styrene-isoprene rubber isoprene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber, and the like.
  • the filler compounded into the rubber composition of the present technology is not particularly limited, and any conventionally known filler that is compounded into a rubber composition for a tire may be used.
  • Examples of the filler described above include silica, carbon black, calcium carbonate, magnesium carbonate, talc, clay, alumina, aluminum hydroxide, titanium oxide, calcium sulfate, and the like. One type of these may be used alone, or two or more types may be used in combination.
  • silica and/or carbon black are preferable.
  • silica examples include wet silica (hydrous silicic acid), dry silica (silicic anhydride), calcium silicate, aluminum silicate, and the like. One type of these may be used alone, or two or more types may be used in combination.
  • the content of the silica described above is not particularly limited but is preferably from 10 to 100 parts by mass and more preferably from 20 to 90 parts by mass per 100 parts by mass of the diene rubber described above.
  • the carbon black is not particularly limited and, for example, carbon blacks of various grades, such as SAF-HS, SAF, ISAF-HS, ISAF, ISAF-LS, IISAF-HS, HAF-HS, HAF, HAF-LS, and FEF, can be used.
  • the content of the carbon black is not particularly limited but is preferably from 1 to 100 parts by mass and more preferably from 5 to 80 parts by mass per 100 parts by mass of the diene rubber described above.
  • the rubber composition of the present technology contains the silica described above
  • the rubber composition preferably contains a silane coupling agent because it improves the reinforcing performance of the tire.
  • the content thereof is preferably from 2 to 16 parts by mass and more preferably from 4 to 10 parts by mass per 100 parts by mass of the silica described above.
  • silane coupling agent examples include bis(3-triethoxysilylpropyl)tetrasulfide, bis(3-triethoxysilylpropyl)trisulfide, bis(3-triethoxysilylpropyl)disulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilylpropyl-N,
  • the rubber composition of the present technology may contain various other additives typically used in a rubber composition for a tire including a vulcanizing agent such as sulfur; a sulfenamide-based, guanidine-based, thiazole-based, thiourea-based, or thiuram-based vulcanization accelerator; a vulcanization accelerator aid such as zinc oxide and stearic acid; wax; aroma oil, an anti-aging agent; and a plasticizer.
  • a vulcanizing agent such as sulfur
  • a sulfenamide-based, guanidine-based, thiazole-based, thiourea-based, or thiuram-based vulcanization accelerator such as zinc oxide and stearic acid
  • wax such as zinc oxide and stearic acid
  • aroma oil, an anti-aging agent such as sodium stearic acid
  • plasticizer such as zinc oxide and stearic acid
  • the rubber composition of the present technology can be vulcanized or crosslinked under conventional, publicly known vulcanizing or crosslinking conditions.
  • the pneumatic tire of the present technology (also simply called the “tire of the present technology” hereafter) is a pneumatic tire using the rubber composition of the present technology described above.
  • FIG. 1 is a schematic partial cross-sectional view of a tire that illustrates one embodiment of a tire of the present technology, but the tire of the present technology is not limited to the embodiment illustrated in FIG. 1 .
  • reference sign 1 denotes a bead portion
  • reference sign 2 denotes a sidewall portion
  • reference sign 3 denotes a tire tread portion
  • a carcass layer 4 in which a fiber cord is embedded, is mounted between a left-right pair of bead portions 1 , and ends of the carcass layer 4 are wound by being folded around bead cores 5 and a bead filler 6 from an inner side to an outer side of the tire.
  • a belt layer 7 is provided along the entire periphery of the tire on the outer side of the carcass layer 4 .
  • rim cushions 8 are provided in parts of the bead portions 1 that are in contact with a rim.
  • the tire of the present technology can be produced by, for example, forming a tread portion, a sidewall portion, or the like by vulcanization or crosslinking at a temperature corresponding to the type and compounding ratio of the diene rubber, filler, vulcanizing agent or crosslinking agent, and vulcanization accelerator or crosslinking accelerator contained in the rubber composition of the present technology.
  • a rubber composition was obtained by adding the sulfur and the vulcanization accelerator to the cooled composition and kneading the mixture using an open roll.
  • SBR styrene-butadiene copolymer
  • Each prepared rubber composition (unvulcanized) was molded into a tread shape and attached to other tire members using a tire molding machine to form an unvulcanized tire, and this was vulcanized for 20 minutes at 160° C. to produce a test tire (195/65R15).
  • the produced test tires were mounted on an FF-type test vehicle (engine displacement: 1.6 L), and the vehicle was run for 8000 km on a test course.
  • the average wear life of the left and right wheels was determined based on the amount of wear and the effective groove depth of a first groove (main groove) of the driving wheels (front wheels) and was expressed as an index using the value of Comparative Example 1 as an index of 100. A larger value indicates higher wear resistance.
  • Table 1 The results are shown in Table 1 below.
  • a vulcanized rubber sheet was prepared by press-vulcanizing each of the prepared (unvulcanized) rubber compositions at 160° C. for 20 minutes in a mold (15 cm ⁇ 15 cm ⁇ 0.2 cm).
  • the vulcanized rubber sheet produced as described above was measured for tan ⁇ (60° C.) using a viscoelastic spectrometer (manufactured by Iwamoto Seisakusho) in accordance with JIS K6394:2007 under the following conditions: a elongation deformation strain of 10% ⁇ 2%; a frequency of 20 Hz; and a temperature of 60° C.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Tires In General (AREA)
US15/571,257 2015-05-01 2016-04-22 Rubber composition and pneumatic tire Active 2036-06-20 US11077711B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2015094285 2015-05-01
JPJP2015-094285 2015-05-01
JP2015-094285 2015-05-01
PCT/JP2016/062765 WO2016178375A1 (ja) 2015-05-01 2016-04-22 ゴム組成物および空気入りタイヤ

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US20180134078A1 US20180134078A1 (en) 2018-05-17
US11077711B2 true US11077711B2 (en) 2021-08-03

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US (1) US11077711B2 (de)
EP (1) EP3290471B1 (de)
JP (1) JP6523441B2 (de)
KR (2) KR20170132839A (de)
CN (1) CN107614589A (de)
WO (1) WO2016178375A1 (de)

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
JP6496191B2 (ja) * 2015-06-02 2019-04-03 株式会社ブリヂストン ゴム組成物及び重荷重用タイヤ
JP6769098B2 (ja) * 2016-05-10 2020-10-14 横浜ゴム株式会社 ゴム組成物およびそれを用いた空気入りタイヤ
JP7082367B2 (ja) * 2018-05-02 2022-06-08 横浜ゴム株式会社 加硫ゴムの耐摩耗性の予測方法
EP3788103A4 (de) 2018-05-04 2022-01-12 Bridgestone Americas Tire Operations, LLC Kautschukzusammensetzung für reifenlauffläche

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US6472464B1 (en) 1996-03-29 2002-10-29 Bridgestone Corporation Styrene-butadiene copolymer and rubber composition comprising the copolymer
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Publication number Publication date
KR20190136118A (ko) 2019-12-09
US20180134078A1 (en) 2018-05-17
JP6523441B2 (ja) 2019-05-29
EP3290471A4 (de) 2018-12-12
EP3290471B1 (de) 2019-12-18
KR20170132839A (ko) 2017-12-04
JPWO2016178375A1 (ja) 2017-12-14
CN107614589A (zh) 2018-01-19
KR102341868B1 (ko) 2021-12-22
EP3290471A1 (de) 2018-03-07
WO2016178375A1 (ja) 2016-11-10

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